Jocelyn B.

I help founders and product teams build, launch, and improve mobile applications. As a London-based Senior Mobile Developer, I take ownership of the entire development lifecycle, from architecture and implementation to App Store and Google Play releases, performance improvements, and ongoing maintenance. I bring more than just coding skills. I understand the challenges of maintaining real-world applications, particularly those with existing users, complex integrations and established codebases. My technical expertise includes Swift, Objective-C, React Native, TypeScript, Flutter and Capacitor for mobile development, alongside Node.js, Python, Firebase and Supabase for backend development and integrations. I'm equally comfortable working with native applications, cross-platform frameworks and existing codebases that need modernising. I take a practical, results-focused approach to development, prioritising maintainability, performance, security and long-term reliability. I also use modern AI-assisted development tools where appropriate to improve efficiency, while applying my own engineering experience to review, validate and test the results. I can also integrate AI-powered functionality into applications using technologies such as OpenAI APIs. Based in London, UK, I offer clear communication, a collaborative approach and the ability to work independently or alongside your existing development team. Whether you're launching a new application, improving an existing product or need an experienced developer to resolve difficult technical challenges, I'd be happy to discuss how I can help. Skills ✅ Polishing AI-generated code for release on the App Stores. I am used to working with Claude / Cursor or Codex generated code as well as Loveable Apps. ✅ Contact me if you are looking for a Code Review Engineer or architecture roles to keep Claude / Cursor on the right track. ✅ I have used Swift professionally since it's introduction in 2014, including RxSwift and SwiftUI. ✅ Ten years of Objective-C experience. ✅ Deep experience of React-Native. I can produce pixel-perfect UI's on Android and iOS. ✅ Adept at upgrading existing Expo and React-native Apps. If you are having an issue updating or upgrading Expo, talk to me first. ✅ Experience with dealing with Apple and adding Apps to the App store. ✅ Extensive knowledge of creating Mac Desktop software installers, including PackageMaker / Packages / Pkgbuild / Pkg as well as making Dmg packages. I can also help with notarization issues. ✅ If you a need UI/Wizard based installer (pkg) then talk to me as I have written several for installing software onto Macs. These use Installer Plugins to work their magic. ✅ Actual professional experience of using Flutter for Client projects. ✅ Long experience of taking on existing projects and maintaining, fixing bugs and add new features to them. ✅ Specialities including VPN (OpenVPN, iKev2, Network Extensions), OpenCV, and adding animation, including SpriteKit. ✅ Latest projects include Fintech with Plaid / Yapily / Token, integrating Zendesk chat solutions into iOS / React Apps. Also advanced visual processing with OpenCV and Machine Learning with CoreML. ✅ Other recent projects have included P2P mesh transfers on Android, and Crypto Payments with Web3/WalletConnect on Swift, and video calling Apps using WebRTC (React-Native / Swift). ✅ Talk to me about Clover POS Development with Android (Java / Kotlin). ✅ ChatGPT Integration with iOS, React-Native / Expo or MacOS. ✅ Bidlogix / BidJS integrations for Auction Houses. ✅ Firebase and Supabase integrations ✅ Electron Apps Packaging and Notarisation / Notarising. Keywords for Search Engines • iOS, Android, Flutter, React Native, iPhone, Ipad, Application, Mobile App Developer, Full time Freelancer, Clover POS, IPhone app, Swift, Dart, Kotlin. Smartphone App, Mobile App Development, Android App Development, iOS Development, Native iOS, Native Android, Flutter/Dart, Expert Swift/iOS developer, Firebase, Electron, Capacitor, Supabase